印染废水回用水处理复合药剂的开发与应用

针对印染废水回用率低、回用水水质要求高等特点,采用活性炭、聚合硫酸铁(PFS)、聚合氯化铝(PAC)、膨润土等药剂对印染废水生化出水进行处理,考察单一药剂成分对废水处理效果的影响。结果表明,单一PAC、PFS难以同时有效去除印染废水中的CODCr和色度,活性炭的处理效果较好,但成本较高。基于各药剂成本、处理效果等多种因素,开发了针对漂洗回用水水质标准的复合药剂1和针对染色用水水质标准的复合药剂2。复合药剂1中m(活性炭)∶m(PAC)∶m(PFS)∶m(膨润土)=5∶60∶5∶30;复合药剂2中m(活性炭)∶m(PAC)∶m(PFS)∶m(膨润土)=45∶30∶5∶20。研究结果表明,复合药剂1和复合药剂2处理1#水样的最佳投加量均为500 mg/L,最佳初始p H值分别为6和7,反应时间均为30 min;处理2#水样的最佳投加量分别为400和500 mg/L,初始p H值为6和6~7,反应时间分别为45~60和60 min。2种印染废水经复合药剂处理后水质均能达到相关出水水质的要求。

Development and application of complex water treatment agents for reuse of printing and dyeing wastewater

In view of the low recovery ratio and the strict quality requirement for printing and dyeing wastewater reuse, activated carbon, poly ferric sulfate (PFS), poly aluminium chloride (PAC), bentonite and some other agents were used to treat biochemical effluent of printing and dyeing wastewater, the effect of agents with single component on wastewater treatment was investigated. The results showed that, CODCr and chroma can hardly be effectively removed from printing and dyeing wastewater simultaneously using single PAC or PFS; acti-vated carbon which could obtain better treatment effect also cost higher. Based on the comprehensive consideration of agent cost, treatment effect and several other factors, complex agent #1 and complex agent #2 for wastewater treatment were developed and adopted so as to ensure the effluent water quality met the requirement of rinsing water reuse and dyeing water reuse respectively. The mass ratios of PAC, PFS and bentonite in the complex agent #1 and complex agent #2 were 5:60:5:30 and 45:30:5:20 respectively. The study results showed that, for the treatment of water sample #1, the optimal dosage of complex agent #1 and agent #2 were both 500 mg/L, the optimal pH value were 6 and 7 respectively, the reaction time were both 30 min; for the treatment of water sam-ple 2#, the optimal dosage of the said two agents were 400 and 500 mg/L respectively, the initial pH value were 6 and 6~7 respectively, the reaction time were 45~60 and 60 min respectively. The quality of the two kinds of printing and dyeing wastewater treated by the complex agents could meet the requirement of relevant standard.